Theta Cassiopeiae
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Theta Cassiopeiae or θ Cassiopeiae is a solitary[5] star in the northern constellation of Cassiopeia. It shares the traditional name Marfak Template:IPAc-en with μ Cassiopeiae, positioned less than half a degree to the WSW,[13] which is derived from the Arabic term Al Marfik or Al Mirfaq (المرفق), meaning "the elbow".[14] At an apparent visual magnitude of 4.3,[3] Theta Cassiopeiae is visible to the naked eye. Based upon an annual parallax shift of 24.42 mas,[2] it is located about 134 light years from the Sun. It has a total annual proper motion of 0.227 arcseconds per year,[15] and is slowly drifting further away from the Sun with a radial velocity of 2.5 km/s.[7]
In Chinese, Script error: No such module "Lang". (Script error: No such module "Lang".), meaning Flying Corridor, refers to an asterism consisting of θ Cassiopeiae, ι Cassiopeiae, ε Cassiopeiae, δ Cassiopeiae, ν Cassiopeiae and ο Cassiopeiae.[16] Consequently, θ Cassiopeiae itself is known as Script error: No such module "Lang". (Script error: No such module "Lang"., Template:Langx.)[17]
This is an A-type main sequence star with a stellar classification of A7 V.[5] The star has 1.9 times the Sun's mass and 2.5 times the Sun's radius.[9] It is about 650 million years in age[11] and is spinning with a projected rotational velocity of 103 km/s.[4] This is a candidate Vega-type system, which means it displays an infrared excess suggesting it has an orbiting debris disk.[18] It is a suspected Delta Scuti variable.[6]
The star appears to be a member of a leading tidal tail of the Hyades cluster.[19]
References
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- ↑ Template:Cite simbad
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- ↑ Template:In lang 中國星座神話, written by 陳久金. Published by 台灣書房出版有限公司, 2005, Template:ISBN.
- ↑ Template:In lang 香港太空館 - 研究資源 - 亮星中英對照表 Template:Webarchive, Hong Kong Space Museum. Accessed on line November 23, 2010.
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External links
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